A plane electromagnetic wave travels in dielectric medium of relative permittivity 9. Relative to free space, the velocity of propagation in the dielectric is

1.

A plane electromagnetic wave travels in dielectric medium of relative permittivity 9. Relative to free space, the velocity of propagation in the dielectric is

[A].	increased by a factor of 9
[B].	increased by a factor of 3
[C].	unchanged
[D].	reduced by a factor of 1/3

Answer: Option D

Explanation:

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